.col_sp {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.comment_div {
    max-height: 50%;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
}

.feed_div {
    height: 81px;
}

.comment_list {
    flex: 1;
    overflow-y: auto;
}